vw golf gt tdi - drivers door light and lock - carol370

my dash board display is saying the drivers door is open, when it is actually closed. Also it will not lock with the remote button on key, i have to lock it manually. But it will unlock with remote. I checked fuses to no luck and now my airbag warning light is on. How do i reset my airbags? and how can i fix the drivers door problem? Any advice greatly received, thanks Carol.